They ran different shapes and materials through a wind tunnel to see which shape and material would decrease energy output so that it takes in equal COthan it puts out.
Answer: The United States must lead the space race to prevent future wars.
Explanation: Hope this helps
Answer:
because people have different opinions on nails and screws
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<em>The main sources of error in the collection of data are as follows : Due to direct personal interview. Due to indirect oral interviews. Information from correspondents may be misleading.</em>
